{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2023-54267",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-54267",
    "idYear": 2023,
    "status": "PUBLISHED",
    "publishedAt": "2025-12-30T12:15:58.914Z",
    "updatedAt": "2026-05-11T19:58:40.112Z",
    "importedAt": "2026-10-24T01:57:03.413Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "powerpc/pseries: Rework lppaca_shared_proc() to avoid DEBUG_PREEMPT",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/pseries: Rework lppaca_shared_proc() to avoid DEBUG_PREEMPT\n\nlppaca_shared_proc() takes a pointer to the lppaca which is typically\naccessed through get_lppaca().  With DEBUG_PREEMPT enabled, this leads\nto checking if preemption is enabled, for example:\n\n  BUG: using smp_processor_id() in preemptible [00000000] code: grep/10693\n  caller is lparcfg_data+0x408/0x19a0\n  CPU: 4 PID: 10693 Comm: grep Not tainted 6.5.0-rc3 #2\n  Call Trace:\n    dump_stack_lvl+0x154/0x200 (unreliable)\n    check_preemption_disabled+0x214/0x220\n    lparcfg_data+0x408/0x19a0\n    ...\n\nThis isn't actually a problem however, as it does not matter which\nlppaca is accessed, the shared proc state will be the same.\nvcpudispatch_stats_procfs_init() already works around this by disabling\npreemption, but the lparcfg code does not, erroring any time\n/proc/powerpc/lparcfg is accessed with DEBUG_PREEMPT enabled.\n\nInstead of disabling preemption on the caller side, rework\nlppaca_shared_proc() to not take a pointer and instead directly access\nthe lppaca, bypassing any potential preemption checks.\n\n[mpe: Rework to avoid needing a definition in paca.h and lppaca.h]",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "f13c13a005127b5dc5daaca190277a062d946e63",
              "status": "affected",
              "versionType": "git",
              "lessThan": "953c54dfdc5d3eb7243ed902b50acb5ea1db4355"
            },
            {
              "version": "f13c13a005127b5dc5daaca190277a062d946e63",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2935443dc9c28499223d8c881474259e4b998f2a"
            },
            {
              "version": "f13c13a005127b5dc5daaca190277a062d946e63",
              "status": "affected",
              "versionType": "git",
              "lessThan": "4c8568cf4c45b415854195c8832b557cdefba57a"
            },
            {
              "version": "f13c13a005127b5dc5daaca190277a062d946e63",
              "status": "affected",
              "versionType": "git",
              "lessThan": "3c5e8e666794d7dde6d14ea846c6c04f2bb34900"
            },
            {
              "version": "f13c13a005127b5dc5daaca190277a062d946e63",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f45ee5c074013a0fbfce77a5af5efddb01f5d4f4"
            },
            {
              "version": "f13c13a005127b5dc5daaca190277a062d946e63",
              "status": "affected",
              "versionType": "git",
              "lessThan": "eac030b22ea12cdfcbb2e941c21c03964403c63f"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "3.12",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "3.12"
            },
            {
              "version": "5.10.195",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.132",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.53",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.4.16",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.4.*"
            },
            {
              "version": "6.5.3",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.5.*"
            },
            {
              "version": "6.6",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}